Mold for sewers.



T. E. CLARK. MOLD Foa sBwERs. APPLICATION FILED MAR. 15. 1909.

Patented Feb. s, 1910.

Inu/Euros WITNESSES:

j unirsi) sra- Tas P i MOLD Fossati/fijas. i i

To all whom 'ttf/nay concern:

Be it known that I, Ti-iEoooiin Entswon'iii CLARK, a citizen of theUnited States, residing at Sacramento, .in the. county of Sacramento andState of California, have invented new and useful Improvements in Moldsfor Sewers, of which the following is a specification. v

Mg' invention relates to improvements in inol s for sewers, conduits,etc., which are constructed of cement, concrete, or other suitablebuilding materials, and the object of my invention is to provide a moldthat may readily be removed from the sewerpipe or conduit after the saidpipe has been constructed aboutit. .l On December 2nd, 1908, I filed anappli cation for Letters Patent, Serial Number 465,660,0n a mold forsewers; the means Shown in that application were particularly adaptedfor vmolds of say eighteen inches in diameter and larger. In the presentapplication, the means employed are better suited Afor molds of smallerdiameter` though I do not wish it understood thatV I limit theapplication to molds of any'particular size.

I- attain the objects specified, and others which are apparent, by themechanism de- .scribed in this specification and illustrated 30.

in the accompanying drawings which form part thereof and in whichsimilar letters or figures refer to similar parts throughout.

Figure 1 is a ci'oss sectional view of the mold. Fig. 2 is.a top view ofthe means used for contracting the mold.- F ig. 3 is a vtop view of Ythemold.

In the drawings. 1 is a flexible sheetsteel or iron tubular shell withits longitudinal seam left unriveted or unfastened together, one edgeoverlapping the other as shown. 9.-'-2 'are lugs securely fastened tothe inner surface of the shell by bolts or rivets 4; 3--3 are radialarms integral with the lugs 2 and which are rotatably joined attheirouter ends where they cross each other, bythe bolt 3. The object ofthese arms is to keep the over-lapping, edges of the shell closetogether when the shell is contracted, otherwise they would have atendency to separate.

' 5-5 are draw-bolts passing throughthe Specification of LettersBate-ntf -Ap'plication' filed March 15,

1909. Serial No. 483,556.

the mold may be any desired length consistent with the ease, with whichit may be handled. There are as niany sets oi Apairs of lugs 2 as therearev plates 7 and the lugs '2 are placed at such a distance apart alongon the inner surface of the shell as to correspond with the distanceapart of the plates 7. It is obvious that when the bar '6 is drawn outin the direction as indicated by the arrow in F ig. 42, the draw-boltswill be forced to traverse the slots 8-8 and be drawn nearer together.as they approach the vertex of the plates 7, resulting in the edgesofthe shell over-lapping each other still further and producing therebya contraction of the diameter of the mold. 'Ilie mold therefore mayreadily be withdrawn from the sewer-pipe or conduit after the sainehas'been formed about it. It is also obvious that when the bar G isforced in the opposite direction to that indicated, the

inold will be restored to its original diamscribed, comprising a splitbshell formed of flexible material with its edges overlapping; a seriesof brackets arranged in pairs rigidly secured to the free overlappingedges on the inner surface of the shell.y one end of the brackets ineach pair extending inwardly and rotatably connected together nearthecentral portion of the shell, the other end of the bracket in each pair.being bent and formed concentric with theA shell an' pr'o- .Intestimoni' whereof I havelsignedmy vided with 'draw-bolts; a barextending api .name to this specification in the presence of l10'proxmately the length of the mold'; triangutwol subscribing Witnesses.

iar plates; on -said bar, and slotted openings A5'1n said plates arallel'with two convergent THEODORE ELLSWORTH MARK.'

sides thereof t rough which the draw-bolts Witnesses: above mentionedpass and are in siidablere- EnGAR ALLEN' STICKNEY,

lation thereto i JosEI-HCLAREISCE CARPENTER.

